GB1536071A - Hydraulic control for variable displacement pumps - Google Patents

Hydraulic control for variable displacement pumps

Info

Publication number
GB1536071A
GB1536071A GB37147/77A GB3714777A GB1536071A GB 1536071 A GB1536071 A GB 1536071A GB 37147/77 A GB37147/77 A GB 37147/77A GB 3714777 A GB3714777 A GB 3714777A GB 1536071 A GB1536071 A GB 1536071A
Authority
GB
United Kingdom
Prior art keywords
pumps
displacement
prime mover
signal
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB37147/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Publication of GB1536071A publication Critical patent/GB1536071A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/002—Hydraulic systems to change the pump delivery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements
    • F16H61/465—Automatic regulation in accordance with output requirements for achieving a target input speed

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

1536071 Controlling variable displacement pumps CATERPILLAR TRACTOR CO 6 Sept 1977 [24 Feb 1977] 37147/77 Heading G3P One or more variable displacement pumps 10, 12 driven by a single prime mover 16 are controlled by a system comprising load sensing means 62 receiving pilot fluid from a fixed displacement pump 30 driven by the prime mover 16 and producing a signal proportional to the load on the pumps 10, 12, which is fed to the inlet 50 of an underspeed control valve 44 which is connected to the pilot pump 30 so as to be responsive to the speed of the prime mover, the outlet 52 of the valve 44 being connected to actuators 14 controlling the displacement of the pumps. The actuators 14 maintain the pumps at maximum displacement unless the signal received by them exceeds a predetermined level. If the pumps are overloaded, then the signal from the means 62 will increase, and the decreased pressure drops across orifices 40, 42 caused by the fall in prime mover speed will bias the valve 44 to pass an increased proportion of this signal so that pump displacement is reduced. If however there is a fall in prime mover speed that is not cause by an overload, then the proportion of the signal from the means 62 passed by the valve 44 will still be increased, but this will not be sufficient to reduce pump displacement. Specification no. 1436613 is referred to.
GB37147/77A 1977-02-24 1977-09-06 Hydraulic control for variable displacement pumps Expired GB1536071A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/771,506 US4065228A (en) 1977-02-24 1977-02-24 Hydraulic control for variable displacement pumps

Publications (1)

Publication Number Publication Date
GB1536071A true GB1536071A (en) 1978-12-20

Family

ID=25092044

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37147/77A Expired GB1536071A (en) 1977-02-24 1977-09-06 Hydraulic control for variable displacement pumps

Country Status (4)

Country Link
US (1) US4065228A (en)
JP (1) JPS53105702A (en)
CA (1) CA1044118A (en)
GB (1) GB1536071A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143058A (en) * 1983-06-20 1985-01-30 Komatsu Mfg Co Ltd Fluid operated pump displacement control/system

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5543246A (en) * 1978-09-22 1980-03-27 Komatsu Ltd Volume controller of variable hydraulic pump
JPS5543245A (en) * 1978-09-22 1980-03-27 Komatsu Ltd Volume controller of variable hydraulic pump
JPS5569782A (en) * 1978-11-20 1980-05-26 Japan Steel Works Ltd:The Output-power controller for pumps
SE435750B (en) * 1979-06-15 1984-10-15 Akermans Verkstad Ab DEVICE FOR RESTRICTING FROM A HYDRAULIC DEVICE WITHOUT POWER
CH655982A5 (en) * 1980-05-14 1986-05-30 Rexroth Mannesmann Gmbh Hydrostatic drive system
US4498847A (en) * 1982-06-29 1985-02-12 Kabushiki Kaisha Komatsu Seisakusho Control system for variable displacement hydraulic pumps
JPS6078143A (en) * 1983-10-06 1985-05-02 Nissan Motor Co Ltd Hydraulic controlling apparatus for automatic speed change gear
US4596517A (en) * 1985-01-29 1986-06-24 Poclain Pressurized fluid supply circuit comprising a variable displacement pump
US4739616A (en) * 1985-12-13 1988-04-26 Sundstrand Corporation Summing pressure compensation control
DE3638889A1 (en) * 1986-11-14 1988-05-26 Hydromatik Gmbh TOTAL PERFORMANCE CONTROL DEVICE FOR AT LEAST TWO HYDROSTATIC GEARBOXES
CA2022841A1 (en) * 1989-10-31 1991-05-01 William J. Haley Dual capacity fluid pump
DE4115606A1 (en) * 1991-05-14 1992-11-19 Putzmeister Maschf OVERLOAD PROTECTION DEVICE FOR A DRIVE ENGINE DESIGNED AS AN INTERNAL COMBUSTION ENGINE OF A MAIN PUMP OF A HYDRAULIC PRESSURE SUPPLY UNIT
US5313795A (en) * 1992-12-17 1994-05-24 Case Corporation Control system with tri-pressure selector network
US6551073B1 (en) * 2001-10-26 2003-04-22 W. S. Darley & Co. Mobile constant pressure pumping assembly
CN115045824A (en) * 2022-06-28 2022-09-13 四川航天烽火伺服控制技术有限公司 Fuel pump flow detection system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543508A (en) * 1968-10-16 1970-12-01 Hyster Co Hydrostatic transmission with pressure control
BE794115A (en) * 1971-03-24 1973-05-16 Caterpillar Tractor Co SUMMER VALVE DEVICE
US3841795A (en) * 1972-07-17 1974-10-15 Caterpillar Tractor Co Combined engine speed and pressure responsive control for variable displacement pumps
US3963378A (en) * 1975-06-04 1976-06-15 Caterpillar Tractor Co. Part throttle control -- pump override
US4008004A (en) * 1975-12-22 1977-02-15 Abex Corporation Control system for variable displacement pumps

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143058A (en) * 1983-06-20 1985-01-30 Komatsu Mfg Co Ltd Fluid operated pump displacement control/system

Also Published As

Publication number Publication date
CA1044118A (en) 1978-12-12
US4065228A (en) 1977-12-27
JPS53105702A (en) 1978-09-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee